| 肖磊,裴国霞,张琦,姚雨彤.内蒙古解放闸灌域表层土壤多氯联苯污染特征和来源分析[J].农业环境科学学报,2019,38(12):2772-2778. |
| 内蒙古解放闸灌域表层土壤多氯联苯污染特征和来源分析 |
| Residual characteristics and source analysis of polychlorinated biphenyls in surface soil of the Jiefangzha irrigation area, Inner Mongolia, China |
| 投稿时间：2019-05-07 |
| DOI：10.11654/jaes.2019-0503 |
| 中文关键词: 解放闸灌域 多氯联苯 表层土壤 污染特征 来源分析 |
| 英文关键词: Jiefangzha irrigation area PCBs surface soil residual characteristics source analysis |
| 基金项目:国家自然科学基金项目（51469023） |
|
| 摘要点击次数: 1739 |
| 全文下载次数: 1504 |
| 中文摘要: |
| 在内蒙古解放闸灌域采集49个表层土壤样品，采用气相色谱-电子捕获检测器（GC-ECD）测定8种多氯联苯PCBs的浓度，探讨PCBs的污染特征、组成特征、空间分布和污染来源，以及土壤理化性质对PCBs浓度分布的影响。结果表明，解放闸灌域表层土壤中∑PCBs浓度范围为ND~209.95 ng·g-1，均值为15.09 ng·g-1，与国内外其他地区相比，处于较低污染水平。PCB1、PCB29和PCB47的均值和检出率均较高，是解放闸灌域表层土壤中的优势污染物。土壤中PCBs同系物组成表现为：PCB29（38.65%） > PCB1（33.33%） > PCB47（11.62%） > PCB5（8.25%） > PCB98（8.14%），其余单体的检出量很少，说明主要以低氯联苯污染为主。土壤中PCBs浓度的空间分布存在一定差异性，表现为东北高于西南，其西南部呈点状分布。土壤理化性质对PCBs浓度的影响表现为：PCBs浓度分布受pH值的影响，而不受有机质、EC值、砂粒、粉粒和黏粒的影响。相关性分析和因子分析结果显示，解放闸灌域表层土壤中PCBs的污染源主要来自电容器和变压器油的泄露。 |
| 英文摘要: |
| The residual characteristics of polychlorinated biphenyl(PCB)congeners in 49 surface soil samples collected from the Jiefangzha irrigation area were analyzed by gas chromatography-electron capture detection. The residual characteristics, spatial distribution, and pollution sources were also analyzed. The results showed that the total PCB concentrations in surface soil ranged from below detection limits to 209.95 ng·g-1, with an average value of 15.09 ng·g-1. PCB concentrations observed in this study were comparatively low. PCB1, PCB29, and PCB47 were identified as the most prevalent contaminants in surface soil. The relative PCB homologue content in soil decreased in the following order:PCB29(38.65%) > PCB1(33.33%) > PCB47(11.62%) > PCB5(8.25%) > PCB98(8.14%), indicating that the surface soil in the Jiefangzha irrigation area was mainly contaminated with lower-chlorinated biphenyls. There was a noticeable pattern in the spatial distribution of PCB concentrations in the soil, which was higher in the northeast than in the southwest, and was also sporadic in the southwest. While the soil pH was found to have a significant effect on PCB concentration, it was not affected by organic matter, electrical conductivity, or sand, powder, and clay content. The results of correlation analysis and factor analysis showed that the main sources of PCB pollution in the topsoil of the irrigation area were capacitor and transformer oils. |
| HTML
查看全文
查看/发表评论 下载PDF阅读器 |
